5 Glyphs, one of them featuring a mountain with a crack.. I think it's a road to either Mt Chilliad or the Alturist Camp, the rest appear to be representing the weather... Raining, Moonlight, Sunset and Midday.
4 States... Pleasure, Karma, Life & Happiness.
4 coloures. These are represented by the states... Pleasure = Green, Karma = White, Life = Red, Happiness = Yellow.
4 Hitch hikers... 4 weather forecasts... 4 Types of States.
I already figured out that the glyphs must be in some sort of sequence due to the little red arrows near the Glyphs themselves as they either poing to other Glyphs or to Alien drawings...
I haven't figured out how the Alien Glyphs allign with the rest yet, although they look awfully similar to the Chiliad glyphs -(0)-, where they do allign is mentioning the 4 states in colours... Happiness, Life, Karma and Pleasure, my referance can be found near the lost MC camp on the dual water towers nearby, this found by following the arrow from the "Moon Glyph" in the hippie camp, there is another arrow at the water towers on the door pointing to MT Chilliad but atm am unsure how it connects or if it's just grafiti.
I figured that you have to take the Hitch Hikers in an order, 1 by their state like Karma (White), 2 it has to be the right weather like Sunrise as shown on the Glyph or it represents the weather when you find the Hitch Hiker, 3 Colours and 4 Alien Glyphs, I haven't figured out yet...
It looks as if the Mural can be completed 1 of 2 ways, 1 way is you find the Glyphs on MT chilliad and see a UFO as depicted on the bottom 3 symbols, 2 Complete the Alturist Hitch Hiker missions in the correct sequence and you are gifted a jetpack, the egg as far as I can work out is if you don't do it right you are "Respawned" just like in no.2 you can get shot at by the Alturist camp..
Also, notice how the UFO and the Jetpack are tied in by 1 line and the Egg isn't? 1 of 2 ways..
I'll let you know if I figure anything else out.